package com.example.makerspace.utils;

import org.apache.commons.codec.digest.DigestUtils;

import java.security.MessageDigest;

public class MD5Utils {
    private static final String SALT = "1a2b3c4d";

    public static String md5(String src){
        return DigestUtils.md5Hex(src);
    }

    //前端登录密码到后端传输密码
    public static String inputPassToFromPass(String inputPass){
        String str = "" + SALT.charAt(0) + SALT.charAt(2) + inputPass + SALT.charAt(5) + SALT.charAt(4);
        return md5(str);
    }

    //后端传输密码到db密码
    public static String fromPassToDBPass(String fromPass){
        String str = "" + SALT.charAt(0) + SALT.charAt(2) + fromPass + SALT.charAt(5) + SALT.charAt(4);
        return md5(str);
    }

    //前端传输密码到db密码
    public static String inputPassToDBPass(String inputPass){
        String fromPass = inputPassToFromPass(inputPass);
        String dbPass = fromPassToDBPass(fromPass);
        return dbPass;
    }
    public final static String MD5(String s) {

        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) {
        String inputPass = "123456";
        String fromPass = inputPassToFromPass(inputPass);
        System.out.println(fromPass);
        String dbPass = fromPassToDBPass(fromPass);
        System.out.println(dbPass);
        System.out.println(inputPassToDBPass("123456"));
    }
}
